The nanocomposite synthesis was controlled at 80°C, at which a portion of the ionic liquid could have been transformed to 2-hyroxyethyl learn more formamide in addition
to the main function to convert the Pt precursor to Pt nanoparticles; the ionic liquid being a solvent and a sacrificing reductant. Figure 4 The XRD patterns for (a) graphite as received (graphite), (b) graphite oxide (GO), and (c) graphene (GE), respectively. Table 2 The EA results of graphite oxide, sulfonated-graphite oxide and graphene Sample C wt% H wt% N wt% GO 32.98 2.40 – GO-SO3H 44.62 2.47 1.04 GE 61.82 2.11 2.4 The analysis of morphology and particle size distribution was done by TEM, as shown in Figure 5. In Table 1, entry 1 was found to have sphere morphology with 14.6 nm average particle size and the Pt loading was 12 wt.% from TGA results. And entries 2 and 3 were with 40 wt.% and 14 wt.% in Pt loading and were with 18.8 and 4.7 nm in average particle sizes, respectively. With similar Pt precursor to ionic liquid ratio (entries 1 and 3), the nanocomposites produced with the graphite oxide substrate have much smaller Pt particle sizes and more Pt particles loading (approximately 14 wt.%)
when compared to those produced with the graphene substrate (approximately 12 wt.%). Our previous study showed also that the particle size distribution for Pt loading at 63 wt.% on graphene was about 6 ± 3 nm . The Peptide 17 supplier shapes of Pt AZD6244 molecular weight nanoparticles on graphite oxide were cubic-like in the current study. We supposed that
on the surfaces of graphite oxide are more oxygen-functional groups in favor of anchoring the Pt precursors and formation of the cubic-like shape nanoparticles. On the contrary, on the surfaces of graphene, the oxygen functional groups are much less than that on the surfaces of graphite oxide. Thus, at the same Pt loading, the two substrates would not produce the same shapes and sizes of Pt nanoparticles on graphite oxide or on graphene. But in our previous study of 63 wt.% Pt loading, we did synthesize the cubic Pt on graphene . Herein, the hydrogenation of ID-8 styrene was examined using the same weight percentage of Pt loading. Figure 5 The TEM morphologies of the nanocomposites. (a) Entry 1, 12 wt.% Pt loading on graphene, (b) entry 2, 40 wt.% Pt loading on graphite oxide, and (c) entry 3, 14 wt.% Pt loading on graphite oxide, (d) cube-like morphology of entry 2 with × 100,000 magnification. The upper intersectional images are the particle size distributions, and the lower intersectional images are the TGA results. From the literature survey, CNT-supported palladium (Pd/CNT) and gold (Au/CNT) nanoparticles show negligible catalytic activity for the hydrogenation of benzene at room temperature. Using the Pd/CNT catalyst at 50°C with 10 atm H2, a conversion of benzene to cyclohexane (48.8% after 24 h) was observed.